Apparatus for casting lead.



No. 694,4I8. Patented Mar. 4, I902. c. POTTER.

APPARATUS FOR GASUNG ,LEAD.

(Application filed Sept. 1.8. 1900.)

-(No Model.)

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UNITED STATES PATENT OFFICE.

CARROLL POTTER, OF PHILADELPHIA, PENNSYLVANIA.

APPARATUS FOR CASTING L EAD.

SPECIFICATION forming part of Letters Patent No. 694,418, dated March 4, 1902.

' Application filed September is, 1900. Serial No. 30,380. (to model.)

To aZZ whom it may con/earn:

Beit known that LOARRoLL Po'rrER,a citizen of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania,have invented certain new and useful Improvements in Apparatus for Casting Lead, of which the following is a specification.

The present invention constitutes an improvement applicable to the apparatus described and claimed in Letters Patent No. 451,407, dated April 28th, 1891, and granted to Henry HerbertLloyd and its principal object is to provide safety devices and appliances whereby danger from the escape of molten lead is obviated and whereby the operation of the apparatus is hastened and made more reliable.

To these and other ends, hereinafter set forth, the invention comprises the improve ments about to be described, and particularly pointed out in the claims. 7

The nature, characteristic features, and scope of the invention will be more fully understood from the following description,taken;

in connection with the accompanying drawings, forming part hereof and in which is illustrated, principally in elevation and in part in section, apparatus embodying features of the invention.

In the drawings the apparatus illustrated at the right-hand side consists of a pot or crucible a for containing molten lead, and of what may be termed a pneumatic pump 1) for forcing the lead from the pot into the mold a. This pneumatic pump is fully described in the patent referred to. However, I may say that lead enters it by way of the check-valve d and is forced from it by way of the nozzle 6. The air is supplied from a reservoirfby way of a pipe g. I

The mold c is a two-part mold, and its parts must be held together very firmly in order to resist the pressure of the incoming metal, which is'fed into it under pressure, either by means of the pn eumatic pump described or in any convenient way. In accordance with my inventiomthe two parts of the mold are held, together by means of a piston or plunger h, mounted to work in a suitable cylinder, which in turn is supported by a strong yoke attached to the bed-plate 2', on which the mold from the reservoir f. should equal or exceed the internal area of mold against its spring j by means of airpressure created in the cylindcrfor example, The area of the piston the mold in cases Where the pump and the cylinder are both supplied with air at the same pressure, as shown in the drawings. The cylinder is supplied with 'air by way of the pipe k, and both the pipes g andlc maybe supplied from the pipe Z, that communicates with the air-reservoir f. m and 72 indicate valves, and, as shown, they are three-way valves. The valve m serves to control the supply of compressed air to and from the piston and cylinder, and the valve n serves to control the supply of compressed air to and from the pump 12. It will be noted that the valve m is nearer to the reservoir f than the valve 12-. The purpose of this arrangement is to insure the clam ping together of the parts of the mold by-the piston before the pump 79 can be operated to feed molten lead, as will be hereinafter more fully described.

The mode of operation of apparatus embodying my invention maybe described, in connection with the accompanying drawings, as follows, and in this connection it will be assumed that the valves m and n are both turned so as to communicate with the exhaust-pipes or atmosphere and into position for interrupting the passage of air from the reservoir f: The two parts of a mold are then closed together and the mold is slipped under the piston, which is'held in elevated position by means of the spring j. The nozzle e is then connected with the mold. The valve on is then turned into the position shown in the drawings, so that compressed air reaches the eifective area of the piston and drivesit downward, so that it clamps and holds the two parts of the mold firmly'together. The valve 02 is then opened, sothat compressed air reaches the pump band forces molten lead into the mold,"of which the parts are firmly held together, as described. The action of the piston is very rapid and 'exceedingly reliable, and it is impossible to operate the pump until after the piston has clamped the mold, because compressed air cannot reach the pump until after it has reached the piston, due to the positioning or location of the valves in respect to the airreservoir and the parts which they control. Should the valve 01 be operated first, air cannot reach the pump, because it cannot pass the valve m, and as soon as the valve m is turned so that air can pass it the air reaches the piston as soon as it can the pump.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details without departing from the spirit thereof. Hence I do not limit myself to the precise construction and arrangement of parts hereinabove set forth, and illustrated in the drawings; but,

Having thus described the nature and objects of my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of a supply of compressed air, a pneumatic pump, a piston and its cylinder for clamping molds, pipe connec- In testimony whereof I. have hereunto 35 signed my name.

CARROLL POTTER. In presence of W. J. JACKSON, K. M. GILLIGAN. 

